2^2=4
3^2=9
4^2=16
5^2=25
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No, 18 is not a square number
21 is not the square of an integer. The closest square number is 25.
The square root of 15 being 3.87 the closest whole number would be 4
196
The square root of 118 is not a whole number - the closest square number to 118 is 121 - which is 11 squared.